Myasthenic syndrome is a medical condition that is characterized by muscle weakness and fatigue. There are several synonyms that can be used to describe this condition such as myasthenia, myasthenia gravis, autoimmune myasthenia, and neuromuscular junction disorder. Myasthenia gravis is commonly used synonymously with myasthenic syndrome as it is the most prevalent form of the condition. This autoimmune disorder affects the muscles by impairing signals from the nerves to the muscles that lead to muscle movement. Neuromuscular junction disorder is another synonym for myasthenic syndrome as it refers to the area where the nerves and muscles meet that are affected by the condition.